Lesson Ideas

Triangles abound in this BrainPOP triangle movie! In it, Tim and Moby introduce you to one of the sharpest shapes around. You’ll find out exactly what a triangle is, how many kinds there are, and what all of a triangles angles add up to. Discover the two ways in which we classify angles and the three categories within each group. You’ll also learn which triangles have three equal sides, which have two equal sides, and which has sides that are all different sizes! Finally, you’ll learn what a hypotenuse is, and the difference between acute and obtuse angles. It’s a festival of triangles!

In this lesson plan adaptable for grades 3 through 8, students use BrainPOP resources (including an interactive game) to learn about basic geometry concepts. Students will explore angles, parallel lines, polygons, triangles, circles, and more while applying their findings to real-life situations. This lesson plan is aligned to Common Core State Standards. See more »

In this lesson plan, which is adaptable for grades 3-12, students use BrainPOP resources to explore the unifying principles of geometry. Students will identify pertinent questions related to geometry, answer student-generated geometry questions using BrainPOP resources, and share research findings. This lesson plan is aligned to Common Core State Standards. See more »

In this lesson plan which is adaptable for grades 3-12, students work collaboratively to research selected math skills. Students then create, play, and assess a math game that is designed to apply and reinforce their selected math concept. This lesson plan is aligned to Common Core State Standards. See more »

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Recent Types of Triangles Quizzes

Note: Mixer quizzes are only available to school-wide BrainPOP subscribers.

Academic Standards

Understand that shapes in different categories (e.g., rhombuses, rectangles, and others) may share attributes (e.g., having four sides), and that the shared attributes can define a larger category (e.g., quadrilaterals). Recognize rhombuses, rectangles, and squares as examples of quadrilaterals, and draw examples of quadrilaterals that do not belong to any of these subcategories.

Grade: 04

CCSS.Math.Content.4.G.A.2

Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size. Recognize right triangles as a category, and identify right triangles.

Grade: 04

CCSS.Math.Content.4.MD.C.5

Recognize angles as geometric shapes that are formed wherever two rays share a common endpoint, and understand concepts of angle measurement:

Grade: 04

CCSS.Math.Content.4.MD.C.5b

An angle that turns through n one-degree angles is said to have an angle measure of n degrees.

Grade: 04

CCSS.Math.Content.4.MD.C.7

Recognize angle measure as additive. When an angle is decomposed into non-overlapping parts, the angle measure of the whole is the sum of the angle measures of the parts. Solve addition and subtraction problems to find unknown angles on a diagram in real world and mathematical problems, e.g., by using an equation with a symbol for the unknown angle measure.

Grade: 05

CCSS.Math.Content.5.G.B.3

Understand that attributes belonging to a category of two-dimensional figures also belong to all subcategories of that category. For example, all rectangles have four right angles and squares are rectangles, so all squares have four right angles.

Grade: 07

CCSS.Math.Content.7.G.B.5

Use facts about supplementary, complementary, vertical, and adjacent angles in a multi-step problem to write and solve simple equations for an unknown angle in a figure.

Grade: 07

CCSS.Math.Content.7.G.A.2

Draw (freehand, with ruler and protractor, and with technology) geometric shapes with given conditions. Focus on constructing triangles from three measures of angles or sides, noticing when the conditions determine a unique triangle, more than one triangle, or no triangle.

Grade: 07

CCSS.Math.Content.7.G.A.3

Describe the two-dimensional figures that result from slicing three-dimensional figures, as in plane sections of right rectangular prisms and right rectangular pyramids.